I have a 96' Ram 1500 with a 5.2L (318). Just recently I drove about 60 miles on the highway, everything normal, temps and all. I stopped at a light and when I accelerated again it wouldnt go into overdrive. It seems like its stuck in transition between gears. I had it parked for about and hour and drove again and it all worked normal for another 40 or so miles on the highway non stop, the next time I stopped and accelerated again, same problem. Any thoughts as to whats going on? It is really cold up here, currently about 0-5 degrees so could temp be an issue?